Neo_M590E V1 GPRS Module Hardware User Guide. Version 1.0

Transcription

1 Neo_M590E V1 GPRS Module Hardware User Guide Version 1.0

2 Copyright Neoway Technology Co., Ltd All rights reserved. No part of this document may be reproduced or transmitted in any form or by any means without prior written consent of Shenzhen Neoway Technology Co., Ltd. is the trademark of Neoway Technology Co., Ltd. All other trademarks and trade names mentioned in this document are the property of their respective holders. Notice This document is intended for system engineers (SEs), development engineers, and test engineers. The information in this document is subject to change without notice due to product version update or other reasons. Every effort has been made in preparation of this document to ensure accuracy of the contents, but all statements, information, and recommendations in this document do not constitute a warranty of any kind, express or implied. Neoway provides customers complete technical support. If you have any question, please contact your account manager or to the following addresses: Sales@neoway.com Support@neoway.com Website: Copyright Neoway Technology Co., Ltd i

3 Revision Record Issue Changes Revised By Date V1.0 Initial draft Weng Copyright Neoway Technology Co., Ltd ii

4 Contents About This Document Introduction to M590E V Overview Block Diagram Specifications Pin Description and PCB Foot Print Specifications and Encapsulation Pin Definition PCB Foot Print Interface Design Power Supply and Switch Interfaces Design Requirements VDD_EXT Power-On/Off Control and Procedure RESET UART SIM Card Interface DTR Pin Running LED Indicator RING Signal Indicator RF Interface RF Design and PCB Layout Recommended RF Connection Electric Features and Reliability Electric Feature Temperature Current ESD Protection RF Features Work Band Transmitting Power and Receiving Sensitivity Transmitting Power Receiving Sensitivity Mounting the Module onto the Application Board Package Abbreviations Copyright Neoway Technology Co., Ltd iii

5 Table of Figures Figure 2-1 Top view of the M590E V1 module... 4 Figure 2-2 PCB foot print recommended for M590E V1 (unit: mm)... 7 Figure 3-1 Current peaks and voltage drops... 8 Figure 3-2 Capacitors used for the power supply... 9 Figure 3-3 Reference design of power supply control... 9 Figure 3-4 Reference design of power supply controlled by p-mosfet Figure 3-5 Reference designs of separated power supply...11 Figure 3-6 Power-on procedure Figure 3-7 Power-off procedure Figure 3-8 Reference circuit for power-on/off control Figure 3-9 Reference circuit for power-on/off controlled by high level Figure 3-10 Reset circuit with triode separating Figure 3-11 Signal connection between DCE and DTE Figure 3-12 Recommended circuit for the communication between 3.3V MCU and UART Figure 3-13 Recommended circuit for the communication between 5V MCU and UART Figure 3-14 Reference design of SIM card interface Figure 3-15 Reference of SIM card socket Figure 3-16 LED indicator Figure 3-17 RING indicator for SMS Figure 3-18 Reference design for antenna interface Figure 3-19 RF layout reference Figure 3-20 Reference RF design when pin 21 is not used Figure 3-21 I-PEX connector Copyright Neoway Technology Co., Ltd iv

6 Table of Tables Table 1-1 M590E V1 specifications... 2 Table 2-1 M590E V1 pin definition... 5 Table 3-1 Power supply and switch interface... 8 Table 3-2 UART Table 3-3 SIM Card Interface Table 3-4 LED indicator Table 4-1 Electric feature of the module Table 4-2 Temperature Feature Table 4-3 Current feature Table 4-4 ESD feature of the module Table 5-1 Work band Table 5-2 Transmitting power (EGSM900) Table 5-3 Transmitting power (DCS1800) Copyright Neoway Technology Co., Ltd v

7 About This Document This document defines the features, indicators, and test standards of the M590E V1 module and provides reference for the hardware design of each interface. With Neo_M590E V1 GPRS Module AT Command Set, this user guide can help you complete wireless communication application easily. 1 Introduction to M590E V1 M590E V1 is a compact wireless GPRS module. It provides SMS and data services and is widely used in industrial and consumer fields. 1.1 Overview Neoway M590E V1 module adopts 27-pin LGA encapsulation and its dimensions are 27.6 mm x 21.6 mm x 2.6 mm. It provides customers the following hardware resources: UART interfaces, used for data communication, HOST interfaces, firmware updating and commissioning 10-bit ADC input, voltage ranging from 0 V to 1.8 V Adapting to 1.8 V and 3.0 V SIM card, Supporting embedded M2M SIM card Supporting LIGHT (working status indicator) RING output MIC input 1.2 Block Diagram The M590E V1 module consists of baseband controller, Flash ROM, RF section, application interfaces, etc. All sections coordinate with each other to provide such communication functions as GPRS data and voice. The following figure shows the block diagram of M590E R2. Copyright Neoway Technology Co., Ltd 1

8 1.3 Specifications Table 1-1 M590E V1 specifications Specifications Band Sensitivity Max. transmit power Description EGSM900/DCS1800 MHz dual-band Supporting band locking < -107 dbm EGSM900 Class4(2W) DCS1800 Class1(1W) Protocol Compatible with GSM/GPRS Phase 2/2+ AT GSM07.07 Extended AT commands Copyright Neoway Technology Co., Ltd 2

9 SMS TEXT/PDU Supporting SMS message receiving and transmitting and alert for new SMS messages Supporting SMS message management: reading/deleting/storage/list GPRS feature GPRS CLASS 10 Max. theoretic downlink rate: 85.6 Kbit/s Built-in TCP/IP protocol, supporting multiple links Supporting server and client modes Supporting UART multiplexing UART CPU Antenna feature Supporting AT sending, data transmission, and software download Supporting baudrate from 9600 bit/s to bit/s X-CPU 312MHz 50 Ω impedance Operating temperature -40 to +85 Operating voltage Peak current Idle current Current in sleep mode 3.5 V to 4.3 V (3.9 V is recommended) Max 2.0 A 11 ma < 1.5 ma (DRX2) Copyright Neoway Technology Co., Ltd 3

10 2 Pin Description and PCB Foot Print 2.1 Specifications and Encapsulation Specifications M590E R2 Dimensions 27.6 mm x 21.6 mm x 2.6 mm (H x W x D) Weight Encapsulation 2.7 g 27-pin LGA Figure 2-1 Top view of the M590E V1 module 21 GPRS_ANT GND 1 20 GND VBAT 2 19 ON/OFF VBAT GND LIGHT M590E R2 Top View RESET NC ADC_IN VDD_EXT 6 15 GND URXD 7 14 VSIM UTXD 8 13 SIM_RST DTR 9 12 SIM_CLK RING SIM_DATA MIC_P MIC_N HOST-RX HOST_TX GND NC Power GND UART ADC GPRS_ANT SIM NC Other Copyright Neoway Technology Co., Ltd 4

11 2.2 Pin Definition Table 2-1 M590E V1 pin definition Pin Name I/O Function Reset Status Level (V) Feature Remarks Power Supply and Switch Interfaces 2, 3 VBAT P 6 VDD_EXT P Main power supply input 2.8 V power supply output 3.5 V to 4.3 V (3.9 V is recommended) Supply power for IO level shifting circuit. Load capability: less than 50 ma 1, 4, 15, 20, 26 GND P Ground 19 ON/OFF DI On/Off input 18 RESET DI Reset input UART Interface 7 URXD DI UART data receive I/PU 8 UTXD DO UART data transmit 24 HOST_RX DI HOST data receive 25 HOST_TX DO HOST data transmit SIM Card 0<V IL< <V IH<VBAT 0<V IL< <V IH<3.1 0<V IL< <V IH<3.1 0<V OL< <V OH<2.8 Low-level pulse can change the On/Off state. Low level reset With 47K pull-up inside Used for module upgrade 11 SIM_DATA DI/O SIM card data IO 0<V IL<0.25*VSI M, SIM card clock 12 SIM_CLK DO output 0.75*VSIM<V IH <VSIM 13 SIM_RST DO 14 VSIM P SIM card reset output SIM card power supply output 0<V OL<0.15*VS IM 0.85*VSIM<V OH <VSIM Compatible with 1.8/3.0 V SIM card LED Indicators 5 LIGHT DO Status LED I/PD 2.8 V/4 ma output SMS and Incoming Call Ring 10 RING DO Ring output I/PD Output 2.8V/4mA Copyright Neoway Technology Co., Ltd 5

12 ADC Detecting 16 ADC_IN AI 10-bit ADC input Detectable voltage range: 0 V to 1.8 V GPRS Antenna 21 GPRS_ANT AI/O GPRS antenna interface 50 Ω impedance Sleep Mode Controlling 9 DTR AI Signal for controlling sleep mode I/PD 0<V IL< <V IH<3.1 Low level by default Used together with AT commands Audio 22 MIC_P AI Positive electrode of MIC input Vpp 200 mv 23 MIC_N AI Negative electrode of MIC output Reserved Pins 17, 27 NC Must be left disconnected. P: indicates power supply pins NC: indicates pins that are not supported and must not be connected DI: indicates digital signal input pins DO: indicates digital signal output pins I/PD: indicates digital signal input pins with pull-down I/PU: indicates digital signal input pins with pull-up AI: indicates analogy signal input pins AO: indicates analogy signal output pins The maximum input voltage at all IO ports (including peak signal current) cannot exceed 3.1 V because the module uses a 2.8 V IO power system. In the application of the module, the IO output voltage from the 3.3 V power supply system of the external circuit might greatly overshoot 3.1 V due to the signal integrity design. In this situation, the IO pins of the module might be damaged if the IO signals are connected to the IO port on the 2.8-V system. To rectify this issue, take measures to match the level. For details, see the Section 3.2 UART. Copyright Neoway Technology Co., Ltd 6

13 2.3 PCB Foot Print LGA packaging is adopted to package the pins of the M590E V1 module. Figure 2-2 shows the recommended PCB foot print. Figure 2-2 PCB foot print recommended for M590E V1 (unit: mm) Copper Cut D= M590E V1 Pads 1~20: 1.8*2.4 Pad 21: 1.2* Pitch: X=21.2; Y=2.54 Unit: mm 21.2 Copyright Neoway Technology Co., Ltd 7

14 3 Interface Design 3.1 Power Supply and Switch Interfaces Table 3-1 Power supply and switch interface Signal I/O Function Remarks VBAT P Main power supply input 3.5 V to 4.3 V (3.9 V is recommended) VDD_EXT P 2.8 V power supply output Used only for level shift Loading capability < 50 ma RESET DI Module reset input Reset at low level ON/OFF DI On/Off input Low-level pulse can change the On/Off state Design Requirements VBAT is the main power supply of the module. Its input voltage ranges from 3.5 V to 4.3 V and the preferable value is 3.9V. It supplies power for baseband controller and RF power amplifier. The performance of the VBAT power supply is a critical path to module's performance and stability. The peak input current at the VBAT pin can be up to 2 A when the signal is weak and the module works at the maximum transmitting power. The voltage will encounter a drop in such a situation. The module might restart if the voltage drops lower than 3.5 V. Figure 3-1 Current peaks and voltage drops 2.0 A Input Current 3.9 V Voltage 3.5 V Keep above 3.5 V 0 ms 3.7 ms 7.4 ms 10.7 ms T Copyright Neoway Technology Co., Ltd 8

15 Figure 3-2 shows a recommended power supply design for the module. Figure 3-2 Capacitors used for the power supply Current testing point VBAT I_max Power Supply D1 C1 C2 C3 C4 C5 GPRS Module Close to the pin of the module In the circuit, you can use TVS at D1 to enhance the performance of the module during a burst. SMF5.0AG (Vrwm=5V&Pppm=200W) is recommended. A large bypass tantalum capacitor (220 μf or 100 μf) or aluminum capacitor (470 μf or 1000 μf) is expected at C1 to reduce voltage drops during bursts together with C2 (10 μf capacitor). In addition, you need to add 0.1 μf, 100 pf, and 33 pf filter capacitors to enhance the stability of the power supply. A controllable power supply is preferable if used in harsh conditions. The module might fail to reset in remote or unattended applications, or in an environment with great electromagnetic interference (EMI). You can use the EN pin on the LDO or DC/DC chipset to control the switch of the power supply as shown in Figure 3-3. MIC29302WU in the following figure is an LDO and outputs 3 A current to ensure the performance of the module. Figure 3-3 Reference design of power supply control GPRS_EN EN VOUT VBAT VCC_IN_5V 100 uf TAN MIC29302WU VIN ADJ 0.1 uf 10K 4.75K TVS 5V 470uF TAN 10 uf 0.1 uf 100pF 33pF The alternative way is to use a p-mosfet to control the module's power, as shown in Figure 3-4. When the external MCU detects the exceptions such as no response from the module or the disconnection of GPRS, power off/on can rectify the module exceptions. In Figure 3-4, the module is powered on when GPRS_EN is set to high level. Copyright Neoway Technology Co., Ltd 9

16 Figure 3-4 Reference design of power supply controlled by p-mosfet Q2 is added to eliminate the need for a high enough voltage level of the host GPIO. In case that the GPIO can output a high voltage greater than VCC_IN_3.9V - V GS(th), where V GS(th) is the Gate Threshold Voltage, Q2 is not needed. Reference components: Q1 can be IRML6401 or Rds(on) p-mosfet which has higher withstand voltage and drain current. Q2: a common NPN transistor, e.g. MMBT3904; or a digital NPN transistor, e.g. DTC123. If digital transistor is used, delete R1 and R2. C3: 470 uf tantalum capacitor rated at 6.3V; or 1000 uf aluminum capacitor. If lithium battery is used to supply power, C3 can be 220 uf tantalum capacitor. Protection Place a TVS diode (V RWM=5 V) on the VBAT power supply to ground, especially in automobile applications. For some stable power supplies, zener diodes can decrease the power supply overshoot. MMSZ5231B1T1G from ONSEMI and PZ3D4V2 from Prisemi are options. Trace The trace width of primary loop lines for VBAT on PCB must be able to support the safe transmission of 2A current and ensure no obvious loop voltage decrease. Therefore, the trace width of VBAT loop line is required 2 mm and the ground should be as complete as possible. Separation As shown in Figure 3-1, the GPRS module works in burst mode that generates voltage drops on power supply. Furthermore, this results in a 217 Hz TDD noise through power (One of the way generating noise. Another way is through RF radiation). Analog parts, especially the audio circuits, are subjected to this Copyright Neoway Technology Co., Ltd 10

17 noise, known as a "buzz noise" in GSM systems. To prevent other parts from being affected, it's better to use separated power supplies. The module shall be supplied by an independent power, like a DC/DC or LDO. See Figure 3-5. DC/DC or LDO should output rated peak current larger than 2 A. The inductor used in Reference Design (b), should be a power inductor and have a very low resistance. 10 uh with average current ability greater than 1.2A and low DC resistance is recommended. Figure 3-5 Reference designs of separated power supply DC-DC/LDO Other circuit DC-DC/LDO Other circuit Power Input DC-DC/LDO GPRS module Power Input 10 uh GPRS module Reference Design (a) Reference Design (b) Never use a diode to make the drop voltage between a higher input and module power. Otherwise, Neoway will not provide warranty for product issues caused by this. In this situation, the diode will obviously decrease the module performances, or result in unexpected restarts, due to the forward voltage of diode will vary greatly in different temperature and current. EMC Considerations Place transient overvoltage protection components like TVS diode on power supply, to absorb the power surges. SMAJ5.0A/C could be a choice VDD_EXT It is recommended that VDD_EXT is only used for interface level transformation. VDD_EXT can output 2.8 V and 50 ma. It stops output after the module is shut down Power-On/Off Control and Procedure Prior to turning on the module, power on the host MCU and finish the UART initialization. Otherwise, conflictions may occur during initialization, due to unstable conditions. ON/OFF is a low level pulse active input, used to turn on or off the module. Power-On Procedure While the module is off, drive the ON/OFF pin to ground for at least 1 second and then release, the module will start. An unsolicited message (+MODEM:STARTUP) will be sent to host through UART port, indicating that the module is powered on and can respond to AT commands. When you design your program, you can use the unsolicited message (MODEM:STARTUP) to check whether the module is started or reset improperly. Copyright Neoway Technology Co., Ltd 11

18 Figure 3-6 Power-on procedure VBAT 3s 1.2s ON/OFF 300 ms VDD_EXT UART Power-Off Procedure While the module is on, drive the ON/OFF pin to ground for at least 500 ms and then release, the module will try to detach to network and normally 2 seconds later it will shut down. Another approach to turn off the module is using AT commands. For details, see Neo_M590E V1 GPRS Module AT Commands. Figure 3-7 shows the power-off procedure of the module. Figure 3-7 Power-off procedure VBAT 500 ms 2 s ON/OFF VDD_EXT UART Power-On/Off Control Figure 3-8 shows a reference circuit for ON/OFF control with inverted control logic. Copyright Neoway Technology Co., Ltd 12

19 Figure 3-8 Reference circuit for power-on/off control S 1 ON/OFF GPRS Module TVS Figure 3-9 Reference circuit for power-on/off controlled by high level 4.7K ON/OFF USER_ON R1 GPRS Module R2 47K In Figure 3-9, high level takes effect for ON/OFF on the user side (USER_ON) after level shifting. R1 and R2 can be adjusted according to the driving capability of the USER_ON pin. Use a common NPN transistor, e.g. MMBT3904; or a digital NPN transistor, e.g. DTC123. If digital transistor is used, delete R1 and R2. Level abnormalities at interfaces connected to the external MCU, especially the UART port, might affect the power-on procedure of the module. For example, when a module is turned on, the IO ports of the MCU are still in output status because they have not been initialized completely. The module might fails to start if the UTXD signal (output pin) is forced to pull up or down. The better way to rescue the module from abnormal condition, is to apply a power OFF-ON procedure, rather than using the ON/OFF control signal. In fact ON/OFF signal is software-dependent. Copyright Neoway Technology Co., Ltd 13

20 3.1.4 RESET You can reset the module by keeping the RESET pin low level for more than 100 ms. The pin is pulled up by an internal resistor and the typical high level is 2.8 V. The RESET pin can be left disconnected if not used. If you use 3.3 V IO system, you are advised to separate it by using triode. Please refer to Figure Figure 3-10 Reset circuit with triode separating VDD_EXT 4.7K 47K GPRS Module RESET 3.2 UART Table 3-2 UART Pin No. Signal I/O Function Description Remarks 7 URXD DI UART data receive Internal 47K pullup 8 UTXD DO UART data transmit 24 HOST_RX DI UART data receive 25 HOST_TX DO UART data transmit UART is used for AT commands. Figure 3-11 shows the signal connection between the module (DCE) and the terminal (DTE). Figure 3-11 Signal connection between DCE and DTE DCE DTE URXD UTXD UTXD URXD Copyright Neoway Technology Co., Ltd 14

21 The UART of M590E V1 works at 2.8 V CMOS logic level. The voltages for input high level should not exceed 3.1 V. Supported baud rates are 9600, 14400, 19200, 38400, 57600, bit/s, and the default rate is bit/s. If the UART is interfacing with a MCU that has 3.3 V logic levels, it is recommended that you add a level shifting circuit outside of the module. Figure 3-12 Recommended circuit for the communication between 3.3V MCU and UART VDD_EXT 47K 0.1 uf MCU_UTXD Module_URXD RB521S 33 pf MCU_URXD 200 Module_UTXD 33 pf In Figure 3-12, 100 pf filter capacitor should be placed near the receive pin of the module. Resistance (200 Ω to 470 Ω) and capacity (100 pf to 470 pf) can be selected based on the tested signal wave. Great serial resistance and filter capacity will decrease the signal level, resulting in great signal wave distortion and the low adaptable UART communication baudrate. RB521S-30TE-61, RB521SM-30GJT2R, and LRB521S-30T1G are recommended for separating diode. When the external MCU adopts 5 V IO system, level shifting is required for both UART receive and transmit. Figure 3-13 shows a reference circuit. Copyright Neoway Technology Co., Ltd 15

22 Figure 3-13 Recommended circuit for the communication between 5V MCU and UART VCC_IN VCC_OUT R2 4.7K R3 10K INPUT Q1 OUTPUT In Figure 3-13, INPUT is connected to UTXD of the MCU and VCC_IN is connected to the 5 V power supply of the MCU. OUTPUT is connected to URXD of the module and VCC_OUT is connected to VDD_EXT(2.8V) of the module. If the circuit is far away from the VDD_EXT pin, add a 0.1 μf decoupling capacitor to VCC_OUT. Level shifting between URXD of the MCU and UTXD of the module can be implemented in the same way. The pull-up resistor R3 ranges from 4.7 K to 10 K; R2 ranges from 2 K to 10 K. Resistors are selected based on the voltage of the power supply and UART baudrate. You can select resistors with great resistance to reduce the power consumption when the power supply has great voltage or the baudrate is low. But, the resistance will affect the quality of the square wave. In addition, the circuit performance is affected by the signal traces during PCB layout. It is recommended that you choose a high-speed NPN transistor because the Q1 switch rate will affect the wave quality after level shifting. MMBT3904 or MMBT2222 is recommended. Avoid data produced at UART when the module is powered on. You are advised to send data to the UART 3 seconds after the module is powered on so that the module would not respond wrongly. 3.3 SIM Card Interface M590E V1 supports embedded SIM card (data only). If you use an embedded SIM card, you should leave the SIM card interface disconnected. If you do not use the embedded SIM card, you can design the SIM card interface following this section. The encapsulation of embedded SIM card is QFN 5*6. Copyright Neoway Technology Co., Ltd 16

23 Table 3-3 SIM Card Interface Signal I/O Function Description Remarks VSIM P SIM card power supply output 1.8V/3.0V SIM_CLK DO SIM card clock output SIM_RST DO SIM card reset output SIM_DATA DI/O SIM card data IO Internal pull-up M590E V1 supports 3.0 V and 1.8 V SIM cards. VSIM supplies power for SIM card with 30 ma. SIM_DATA is internally pulled up by a resistor. External pull-up resistor is not needed. SIM_CLK can work at several frequencies at 3.25 MHz typically. Figure 3-14 Reference design of SIM card interface SIM_DATA 20 SIM_CLK SIM_RST CLK RST DATA VPP VSIM VCC GND GPRS Module 1 uf SIM 卡 ESD protectors, such as ESD diodes (lower than 33 pf) or ESD varistors, are recommended on the SIM signals, especially in automotive electronics or other applications with badly ESD. In other applications, replace ESD diodes with 27 pf to 33 pf grounding capacitors. The ESD diodes or small capacitors should be close to SIM card. If you use 6-pin SIM card sockets, MCP-C713(H2.8) is recommended. Figure 3-15 shows its encapsulation. Copyright Neoway Technology Co., Ltd 17

24 Figure 3-15 Reference of SIM card socket SIM card is sensitive to GSM TDD noise and RF interference. So, the PCB design should meet the following requirements: The antenna should be installed far away from the SIM card and SIM card traces, especially to the build-in antenna. The SIM traces on the PCB should be as short as possible and shielded with GND copper. The ESD diodes or small capacitors should be closed to SIM card on the PCB. 3.4 DTR Pin Generally DTR is used for sleep mode control. It works with AT commands. For details, see M590E V1 GPRS Module AT Command Set. Based on the setting of the selected mode, pulling DTR low will bring the module into sleep mode. In this mode, the idle current is less than 2 ma, the module can also respond to the incoming call, SMS, and GPRS data. The host MCU can also control the module to exit sleep mode by controlling DTR. Process of entering the sleep mode: 1. Keep DTR high level in working mode. Activate the sleep mode by using the AT+ENPWRSAVE=1 command. 2. Pull DTR low, and the module will enter sleep mode, but only after process and pending data finished. 3. In sleep mode, the module can be woken up by the events of incoming voice call, received data, or SMS. Meanwhile the module will send out the unsolicited messages by the interface of RING or UART. Copyright Neoway Technology Co., Ltd 18

25 Upon receipt of the unsolicited messages, the host MCU should pull DTR high firstly, otherwise the module will resume sleep mode shortly. Then the host MCU can process the voice call, received data, or SMS. After processing is finished, pull DTR low again to put the module into sleep mode. 4. Pull DTR high, the module will exit from sleep mode actively, and furthermore enable the UART. Thus the voice call, received data, or SMS can be processed through UART. After processing finished pull it low again, to take the module back to sleep mode. 3.5 Running LED Indicator Table 3-4 LED indicator Signal I/O Function Remarks LIGHT DO Indicates running status 2.8 V output, max. 4 ma High level drives the LED indicator The LIGHT pin can output a 4 ma current and 2.8 V voltage, therefore the LED can be directly connected to this pin with a resistor in series. For better luminance, drive the LED with a transistor instead. LIGHT Figure 3-16 LED indicator VCC GPRS Module K GPRS Module 1K LIGHT 10K When the module is running, the LED indicator is driven by the LIGHT to indicate different module status with its various blink behaviors. You can set the blink mode by AT commands. For more details, see Neo_M590E V1 GPRS Module AT Command Set. 3.6 RING Signal Indicator SMS: Upon receipt of SMS, the module outputs one 35 ms low pulse. Figure 3-17 RING indicator for SMS 35 ms Copyright Neoway Technology Co., Ltd 19

26 3.7 RF Interface RF Design and PCB Layout A 50 Ω antenna is required. VSWR ranges from 1.1 to 1.5. The antenna should be well matched to achieve best performance. It should be installed far away from high speed logic circuits, DC/DC power, or any other strong disturbing sources. For multiple-layer PCB, the trace between the antenna pad of module and the antenna connector, should have a 50 Ω characteristic impedance, and be as short as possible. The trace should be surrounded by ground copper. Place plenty of via holes to connect this ground copper to main ground plane, at the copper edge. If the trace between the module and connector has to be longer, or built-in antenna is used, a π-type matching circuit should be needed, as shown in Figure The types and values of C1, L1, and L2 should be verified by testing using network analyzer instrument. If the characteristic impedance is well matched, and VSWR requirement is met, just use a 0 Ω resistor for L1 and leave C1, L2 un-installed. Avoid any other traces crossing the antenna trace on neighboring layer. Figure 3-18 Reference design for antenna interface GPRS_ANT L1 ANT GPRS Module C1 L2 On two-layer boards which cannot control resistance properly, the RF route should be as short and smooth as possible and at a width of 1 mm; the RF is 1 mm away from the ground. Figure 3-19 shows a two-layer board application. The RF is connected to GSC RF connector through traces on PCB, which is connected to the antenna via cable. Remove the copper from the area of 2 mm in diameter around the RF testing point. Dig ground holes as many as possible. Separate this area from the copper-removing area of the 21st pin by ground. Ensure complete ground around the 20 th pin in case that its signal is affected by other high-speed signals (SIM signal, e.g.). Copyright Neoway Technology Co., Ltd 20

27 Figure 3-19 RF layout reference Ensure complete ground at both sides of the 20 th pin. Avoid ground at only one side. Separate the copper-removing area from the RF route by ground. The RF route should be as short and smooth as possible and at a width of 1 mm; the RF is 1 mm away from the ground. Remove the copper from the top layer of the RF testing point (2mm in diameter). Dig ground holes around this are. If you use RF feeder to connect the module and the antenna (pin 21 is not used), remove the pad of the 21 st pin and its adjuncts. Refer to Figure Figure 3-20 Reference RF design when pin 21 is not used Recommended RF Connection If you adopts RF cables for connections, the I-PEX connector (MHF) is recommended. Figure 3-21 shows the encapsulation specifications. Copyright Neoway Technology Co., Ltd 21

28 Figure 3-21 I-PEX connector Copyright Neoway Technology Co., Ltd 22

29 4 Electric Features and Reliability 4.1 Electric Feature Table 4-1 Electric feature of the module Parameter Minimum Value Typical Value Maximum Value VBAT VDD_EXT Vin 3.5 V 3.9 V 4.3 V Iin / / 2 A Vout / 2.8 V / Iout / / 50 ma Vout 2.3 V 2.8 V 3.1 V DIO Iout / / 4 ma Vin -0.3 V 0 V 0.6 V Iin / / 22.5 ua If the voltage is too low, the module might fail to start. If the voltage is too high or there is a voltage burst during the startup, the module might be damaged permanently. If you use LDO or DC-DC to supply power for the module, ensure that it output at least 2 A current. 4.2 Temperature Table 4-2 Temperature Feature Module Status Minimum Value Typical Value Maximum Value Working Storage If the module works in temperature exceeding the thresholds, its RF performance (e.g. frequency deviation or phase deviation) might be worse but it can still work properly. Copyright Neoway Technology Co., Ltd 23

30 4.3 Current Table 4-3 Current feature Parameter Testing Conditions Testing Result (Average Current) Testing voltage 3.9 V Agilent power supply / Off leakage current Power on the module or use AT command to shut the module down. 190 μa Idle mode Set the instrument and power on the module. 11 ma Sleep mode Set the instrument properly (DRX=5) 1.5mA Average network searching current Set the instrument. Start the module. Wait until the module registers the instrument. 35 ma Voice service Maximum power level in full rate mode EGSM900 DCS ma 155 ma GPRS class 12 2Up/3Down@Gamma=3 1Up/4Down@Gamma=3 EGSM900 DCS1800 EGSM900 DCS ma 230 ma 224 ma 160 ma The data in the above table is typical values obtained during tests in lab. It might be a little bit different in manufacturing. Also, the test results might be various due to different settings or testing methods. 4.4 ESD Protection Electronics need to pass sever ESD tests. The following table shows the ESD capability of key pins of our module. It is recommended that you add ESD protection to those pins in accordance to the application to ensure your product quality when designing your products. Humility: 45% Temperature: 25 Table 4-4 ESD feature of the module Testing Point Contact Discharge Air Discharge VBAT ±8 KV ±15 KV GND ±8 KV ±15 KV ANT ±8 KV ±15 KV Copyright Neoway Technology Co., Ltd 24

31 Cover ±8 KV ±15 KV URXD/UTXD ±4 KV ±8 KV Others ±4 KV ±8 KV Copyright Neoway Technology Co., Ltd 25

32 5 RF Features 5.1 Work Band Table 5-1 Work band Work Band Uplink Downlink EGSM ~915 MHz 925~960 MHz DCS ~1785 MHz 1805~1880 MHz 5.2 Transmitting Power and Receiving Sensitivity Transmitting Power Table 5-2 Transmitting power (EGSM900) PCL Transmitting Power Threshold Range 5 33 dbm ±2 dbm 6 31 dbm ±3 dbm 7 29 dbm ±3 dbm 8 27 dbm ±3 dbm 9 25 dbm ±3 dbm dbm ±3 dbm dbm ±3 dbm dbm ±3 dbm dbm ±3 dbm dbm ±3 dbm dbm ±5 dbm dbm ±5 dbm 17 9 dbm ±5 dbm 18 7 dbm ±5 dbm 19 5 dbm ±5 dbm Table 5-3 Transmitting power (DCS1800) PCL Transmitting Power Threshold Range 0 30 dbm ±2 dbm 1 28 dbm ±3 dbm Copyright Neoway Technology Co., Ltd 26

33 2 26 dbm ±3 dbm 3 24 dbm ±3 dbm 4 22 dbm ±3 dbm 5 20 dbm ±3 dbm 6 18 dbm ±3 dbm 7 16 dbm ±3 dbm 8 14 dbm ±3 dbm 9 12 dbm ±3 dbm dbm ±4 Bm 11 8 dbm ±4 Bm 12 6 dbm ±4 Bm 13 4 dbm ±4 dbm 14 2 dbm ±5 dbm 15 0 dbm ±5 dbm Receiving Sensitivity Band GSM800&EGSM900 DCS1800&PCS1900 Typical <-107 dbm <-107 dbm The data in the above tables is obtained by connecting the module to RF test instrument (e.g. CMU200, CWM500, or Agilent8960) in lab tests. It is for reference only. Copyright Neoway Technology Co., Ltd 27

34 6 Mounting the Module onto the Application Board M590E V1 is compatible with industrial standard reflow profile for lead-free SMT process. The reflow profile is process dependent, so the following recommendation is just a start point guideline: Only one flow is supported. Quality of the solder joint depends on the solder volume. Minimum of 0.15 mm stencil thickness is recommended. Use bigger aperture size of the stencil than actual pad size. Use a low-residue, no-clean type solder paste. 7 Package M590E V1 modules are packaged in sealed bags on delivery to guarantee a long shelf life. Package the modules again in case of opening for any reasons. Neoway adopts trays to hold our modules to facilitate mounting. You can just put the tray in fixed direction on your machine. For more details about the storage and mounting of our modules, refer to Reflow Soldering Guide for Neoway SMD Modules V1.2. Copyright Neoway Technology Co., Ltd 28

35 8 Abbreviations ADC AFC AGC AMR CSD CPU DAI DAC DCE DSP DTE DTMF DTR EFR EGSM EMC EMI ESD ETS FDMA FR GPRS GSM HR IC IMEI LCD LED MS PCB PCS Analog-Digital Converter Automatic Frequency Control Automatic Gain Control Acknowledged multirate (speech coder) Circuit Switched Data Central Processing Unit Digital Audio interface Digital-to-Analog Converter Data Communication Equipment Digital Signal Processor Data Terminal Equipment Dual Tone Multi-Frequency Data Terminal Ready Enhanced Full Rate Enhanced GSM Electromagnetic Compatibility Electro Magnetic Interference Electronic Static Discharge European Telecommunication Standard Frequency Division Multiple Access Full Rate General Packet Radio Service Global Standard for Mobile Communications Half Rate Integrated Circuit International Mobile Equipment Identity Liquid Crystal Display Light Emitting Diode Mobile Station Printed Circuit Board Personal Communication System Copyright Neoway Technology Co., Ltd 29

36 RAM RF ROM RMS RTC SIM SMS SRAM TA TDMA UART VSWR Random Access Memory Radio Frequency Read-only Memory Root Mean Square Real Time Clock Subscriber Identification Module Short Message Service Static Random Access Memory Terminal adapter Time Division Multiple Access Universal asynchronous receiver-transmitter Voltage Standing Wave Ratio Copyright Neoway Technology Co., Ltd 30